This experiment was similar to previous weeks, it was the same Lego device, but this time, with some differences.
This time, it was not a car, this time the robot was divided into smaller parts, and acted as a motor to lift a specific weight.
Thus, the experiment consisted of the following devices:
– Lego Motor
– Pulley and rope
– weights
– Infrastructure
The experiment consisted of the following, we were trying to show the relationship between force, mass and acceleration, and how they were related to each other.
To do this, we rely on Newton’s second law, where, F = ma
DATA RECOPILATION
1ST EXPERIMENT
Next, we began to collect the data, the first experiment consisted on three different measurements, always keeping the power at the same level, in this case was 25 N, and we tried to demonstrate the relationship between weight and the acceleration of the object, to the potency given above.
As a result, we obtained the following results:
In the first attempt, we used a mass of m = 0.1 kg, and the acceleration we got, was 250.0, with a Potential Energy of 0.2646.
On the second attempt, we used a mass of m = 0.12 kg, and the acceleration we got, was 208.3, with a Potential Energy of 0,317.
In the third attempt, we used a mass of m = 0.14 kg, and the acceleration we got, was 178.6, with a Potential Energy of 0,370.
CONCLUSION
What these data reveal is that, there is an inverse relationship between mass and acceleration, if the power is constant, ie, that the greater the mass, the less will be the acceleration, since the power is being used, is the same.
On the other hand, we observed that the greater the mass, the greater potential energy is needed to lift the weights, that is, satisfy a directly proportional relation.
2ND EXPERIMENT
The second experiment consisted on three different measurements as well, but this time, we should keep the mass constant, instead of Power.
This time, we maintained a constant mass of 0.1 kg. And we were rising the power used to observe the change in acceleration and the potential energy. The data we obtained were as follows:
In the first attempt, we used a power of P = 25 N, and the acceleration we got, was 250.0, with a potential Energy of 0.2646.
On the second attempt, we used a power of P = 50 N, and the acceleration we got, was 500.0, with a potential Energy of 0.2646.
In the third attempt, we used a power of P = 75 N, and the acceleration we got, was 750.0, with a potential Energy of 0.2646.
CONCLUSION
Thus, we can say that maintaining a fixed mass (0.1Kg) and gradually increasing the power, acceleration, increases in the same proportion that makes the power, ie, they are proportional directly related.
Furthermore, this experiment made us realize that as PE (Potential Energy) = mgh, if we keep the same height ( h = 0.27 m), the same mass (0.1 kg) and the same gravity (9.8 m/s2), potential Energy needed for the job, will not change.